if u like the colors of those tangs, imo u should trade them in and get
1 yellow wrasse (yellow)
1 blue pygmy angel (blue)
1 lawnmower blenny (greyish)
1 blackcap basslet (purple)
1 flame wrasse or 1 flasher wrasse (red)
then you have colorful fish that arnt going to get too big for your tank...